Mercurial > hg > truffle
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/LIRFrameState.java @ 15992:794daffa3850
[inliner] return result versus parameter mutation, former deemed more readable
author | Miguel Garcia <miguel.m.garcia@oracle.com> |
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date | Mon, 02 Jun 2014 16:28:19 +0200 |
parents | 8d8732e14447 |
children | f315b1c0a590 |
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/* * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.lir; import static com.oracle.graal.api.code.ValueUtil.*; import java.util.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.lir.LIRInstruction.OperandFlag; import com.oracle.graal.lir.LIRInstruction.OperandMode; import com.oracle.graal.lir.LIRInstruction.ValueProcedure; /** * This class represents garbage collection and deoptimization information attached to a LIR * instruction. */ public class LIRFrameState { public final BytecodeFrame topFrame; private final VirtualObject[] virtualObjects; public final LabelRef exceptionEdge; protected DebugInfo debugInfo; public LIRFrameState(BytecodeFrame topFrame, VirtualObject[] virtualObjects, LabelRef exceptionEdge) { this.topFrame = topFrame; this.virtualObjects = virtualObjects; this.exceptionEdge = exceptionEdge; } public boolean hasDebugInfo() { return debugInfo != null; } public DebugInfo debugInfo() { assert debugInfo != null : "debug info not allocated yet"; return debugInfo; } /** * Iterates the frame state and calls the {@link ValueProcedure} for every variable. * * @param proc The procedure called for variables. */ public void forEachState(ValueProcedure proc) { for (BytecodeFrame cur = topFrame; cur != null; cur = cur.caller()) { processValues(cur.values, proc); } if (virtualObjects != null) { for (VirtualObject obj : virtualObjects) { processValues(obj.getValues(), proc); } } } /** * We filter out constant and illegal values ourself before calling the procedure, so * {@link OperandFlag#CONST} and {@link OperandFlag#ILLEGAL} need not be set. */ protected static final EnumSet<OperandFlag> STATE_FLAGS = EnumSet.of(OperandFlag.REG, OperandFlag.STACK); protected void processValues(Value[] values, ValueProcedure proc) { for (int i = 0; i < values.length; i++) { Value value = values[i]; values[i] = processValue(proc, value); } } protected Value processValue(ValueProcedure proc, Value value) { if (processed(value)) { return proc.doValue(value, OperandMode.ALIVE, STATE_FLAGS); } return value; } protected boolean processed(Value value) { if (isIllegal(value)) { // Ignore dead local variables. return false; } else if (isConstant(value)) { // Ignore constants, the register allocator does not need to see them. return false; } else if (isVirtualObject(value)) { assert Arrays.asList(virtualObjects).contains(value); return false; } else { return true; } } /** * Called by the register allocator before {@link #markLocation} to initialize the frame state. * * @param frameMap The frame map. * @param canHaveRegisters True if there can be any register map entries. */ public void initDebugInfo(FrameMap frameMap, boolean canHaveRegisters) { debugInfo = new DebugInfo(topFrame, frameMap.initReferenceMap(canHaveRegisters)); } /** * Called by the register allocator to mark the specified location as a reference in the * reference map of the debug information. The tracked location can be a {@link RegisterValue} * or a {@link StackSlot}. Note that a {@link Constant} is automatically tracked. * * @param location The location to be added to the reference map. * @param frameMap The frame map. */ public void markLocation(Value location, FrameMap frameMap) { frameMap.setReference(location, debugInfo.getReferenceMap()); } /** * Called by the register allocator after all locations are marked. * * @param op The instruction to which this frame state belongs. * @param frameMap The frame map. */ public void finish(LIRInstruction op, FrameMap frameMap) { } @Override public String toString() { return debugInfo != null ? debugInfo.toString() : topFrame != null ? topFrame.toString() : "<empty>"; } }